CHROMOSOME RELATIONSHIPS AND MORPHOLOGICAL COMPARISONS BETWEEN THE DIPLOID OATS AVENA PROSTRATA, A. CANARIENSIS AND THE TETRAPLOID A. MAROCCANA

Abstract

The morphology and chromosome pairing of the triploid hybrids Avena canariensis Baum, Rajhathy et Sampson × A. maroccana Gdgr., A. prostrata Ladiz × A. maroccana, the diploid A. prostrata and the tetraploid derived between A. prostrata and A. canariensis and the tetraploid hybrid between this derived tetraploid and A. maroccana are described in relation to genomic affinities between these species. The cytological evidence is at variance with morphological and geographical data which initially indicated that A. canariensis was the donor of the A genome of the A. maroccana-A. murphyi group of tetraploids. The possible relationship between the species is briefly discussed.